This is just due to the fact that you are able to get 16 stacks of Grove Invigoration every 1 minute instead of 2. The only legendary that might have a potential use case is the Night Fae one.
Night Fae - Celestial Spirits, this legendary reduces the cooldown and duration of Convoke the spirits by 50%, the added bonus is that convoke has an increased chance to use an exceptional spell or ability (Think full moon and feral frenzy).Additionally, when Ravenous Frenzy ends you will still keep Sinful Hysteria for 5 seconds and it will not stun you when it ends. Venthyr - Sinful Hysteria, this legendary increases the duration of Ravenous Frenzy by 0.2 seconds every time it is applied.Necrolord - Unbridled Swarm, this legendary gives your Adaptive swarm a 60% chance to split into two swarms every time it jumps target.Kyrian - Kindred Affinity, this legendary gives you and your linked partner a bonus to a specific secondary stat based on their covenant, when you empower your bond the bonus is then doubled.Our 4 new covenant specific legendaries are as followed: Frost - Winds of Winter makes it so your critical strikes start storing up a % of the critical hits damage and after 20 seconds it will explode and deal all the stored up damage, you are then granted an absorb for 100% of the damage dealt by the winds.Blood - Blood Link places a DoT on your primary target which leeches health from them healing you for the amount of damage it deals, it heals an ally if you are full health.Unholy - Chaos Bane grants you a stacking main stat buff based on the level of your shard, at 15 stacks you gain a massive main stat buff for 15 seconds before it resets and starts stacking again.If you have 3 of the same type of shard you are able to obtain a powerful set bonus that works in both the raid and torghast, the 3 set bonuses are as followed:
In the Sanctum of Domination there are special types of gear which drop with “Domination Sockets” in them, these sockets grant powerful bonuses from Shards of Domination which you obtain from killing the raid bosses. There are no class changes to guardian druid in 9.1. Adaptive swarm 's jump range has been increased to 50 yards (Was previously 25 yards), and it will now jump to a friendly target if it expires on a friendly target and there are no available enemies within 50 yards.Swipe is no longer target capped, and deals reduced damage beyond 5 targets.The venthyr specific legendary was nerfed to only grant 0.1 seconds (was 0.2) per ability cast, and the buff only last for 3 seconds (was 5) after sinful hysteria ends. Guardian Druid 4 set - While you’re in Berserk, you radiate (45% of your Attack Power) as magical cosmic damage to nearby enemies, and you heal yourself for (61% of Attack Power) every second.Guardian Druid 2 set - When you use Barkskin, you will also enter Berserk for 4 seconds.
There are no changes for Guardian Druids in Patch 9.2.5. What has changed 9.2.5 Guardian Druid Changes